Law enforcement sources tell us the burglar jacked more than $200k in cash and jewelry from the safe in BC's Tarzana home. We're told Rob, who also stays at the house, discovered the crime and called cops over the weekend.
Our sources say there were no obvious signs of entry, and the safe wasn't busted open -- leading cops to believe someone in Chyna and Rob's inner circle could be responsible.
As we previously reported ... a Blac Chyna and Tyga sex tape is being shopped around town. It's possible the thieves were looking for a hard copy.